The graph shows some interesting data for both impedance vs.
frequency and frequency response. It demonstrates why the
Sony MDR-6V are such favorites among CW operators.
They may not be much for low frequency isolation but the
frequency response and impedance/sensitivity (high) are a
very good match to the K3.
73,
... Joe, W4TV
On 5/28/2010 4:01 PM, Bill W4ZV wrote:
>
>
> Sam Morgan-3 wrote:
>>
>> Besides sealing out noise passively
>>
>
> For those interested in external isolation, I found a really neat
> website which compares noise isolation by frequency range. Select
> among 4 headphones you're interested in, choose Isolation Response
> and then click Compare for a graph of isolation by freqluency:
>
> http://www.headphone.com/learning-center/build-a-graph.php?graphID[0]=1743&graphID[1]=533&graphID[2]=753&graphID[3]=1753&graphType=6&buttonSelection=Compare+Headphones
>
> This shows some significant differences in isolation versus
> frequency. Bose, Sennheiser, Sony and Etymotic models are included
> but Yamaha and Extreme Isolation are not. Low frequency noise is
> most important in my shack due to amplifier fan noise but higher
> frequencies might be more important for a multiop phone environment.
>
> 73, Bill
>
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